383440 has 20 divisors (see below), whose sum is σ = 891684. Its totient is φ = 153344.

The previous prime is 383429. The next prime is 383459. The reversal of 383440 is 44383.

It can be written as a sum of positive squares in 2 ways, for example, as 242064 + 141376 = 492^2 + 376^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

383440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2317 + ... + 2476.

2³⁸³⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

383440 is an abundant number, since it is smaller than the sum of its proper divisors (508244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

383440 is a wasteful number, since it uses less digits than its factorization.

383440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4806 (or 4800 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 383440 is about 619.2253224796. The cubic root of 383440 is about 72.6494736232.

The spelling of 383440 in words is "three hundred eighty-three thousand, four hundred forty".